If you have activated the right option in Preferences, a system folder won't appear unless it has something in it.  If your Lost & Found folder is empty, it would be invisible.  I don't know where the "hide folder" option is in the V3 viewer, but in Firestorm it's in Preferences >>> Firestorm >>> General >>> Hide empty system folders from inventory: If enabled, the inventory window will not display any system folders (eg, Favorites, Landmarks, etc) that have nothin
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